SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7c38cf644c0f9d2f96bb81a954b6e1020d60eaaae493850c1d9f5fe85cc8c5' 
  AND token = 'XAnQnACXM1OaJXu0KygVYobXvOw+/zoHnWKlrpXmGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}